The primary cause of fungal acne is an overgrowth of the yeast species Malassezia, which naturally resides on the skin. Factors contributing to this overgrowth include hot and humid climates, excessive sweating, wearing tight or non-breathable clothing, and using oily skin care products that can clog pores. A compromised immune system or recent antibiotic use can also disrupt the skin’s microbiome, promoting yeast proliferation. Understanding these triggers is key to preventing and managing fungal acne effectively.